Boiler-furnace.



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APPLICATION FILED JULY 10.1906

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UNITED STATES PATENT OFFICE.

PETER SWANGER, OF CANONSBURG, PENNSYLVANIA.

BOILER-FURNACE.

T 0 all whom it may concern:

Be it known that I, PETER SWANGER, citizen of the United States of America, residing at Canonsburg, in the county of fashington and State of Pennsylvania, have invented certain new and useful Improvements in Boiler-Furnaces, of which the following is a specification, reference being had therein to the accompanying drawing. f

This invention relates to boiler furnaces, and its object is to provide a furnace so constructed as to insure a thorough combustion of the gases from the fuel, and to thus materially increase the heating capacity of this class of furnaces.

Heretofore, the fire boxes of boiler furnaces have been located vat the front of the furnace and the smoke and other products of combustion have been conducted rearward from the fire box below the boiler to the rear` ends of the boiler ues.

The present invention is distinguished from the prior art by locating the fire box at the rear of the furnace, and providing an arch over the fire box and bridge wall extending across the width of the furnace and from the rear wall thereof to a point well toward the front end of the boiler, the purpose being to first direct the -flame and products of combustion forward to the front end of the boiler, below the arch, and then rearward through the space between the arch and boiler.

The construction of the furnace will be fully described hereinafter in connection with the accompanying drawings which form a part of this specification, and its novel features will be particularly set forth in the appended claims.

In the drawings: Figure 1, is a longitudinal vertical section of a furnace constructed in accordance with my invention. Fig. 2, is a horizontal section of the same, and lFig. 3, is a transverse vertical section with the grates removed;

The reference numerals 1 and 2 designate respectively, the front and rear walls of the furnace, and 8 and 4 the side walls thereof, the boiler 5 being supported therein in the usual manner.

The rear end wall 2 is provided with fuel openings 6 and ash-pit openings 7, and adja cent to these openings is a fire box or chamber within which is arranged a grate of any suitable construction, that shown in the drawings comprising pivoted grate bar sec- Specicaton of Letters Patent.

Application filed. July 10, 1906.

Patented May 12, 1908.

Serial No. 325,492.

tions S and 9, and a stationary section 10, the pivoted grate bar sections being connected by links 11 to rods 12, the latter being pivotally connected at their outer ends to operating levers 13 fulcrumed upon brackets 14 projecting from the outer side of the wall 2.

The numeral 15 designates a hollow bridgewall extending across the furnace in front of the grate bars, and having inclined air passages 16. A series of air pipes 17 extend through the front of the hollow bridge wall, the front ends of said pipes extending through the front wall of the furnace to supply cold air to the interior of the bridge-wall. I preferably embed the pipes 17 in sand as shown in Fig. 1.

An arch 18, of fire brick, extends over the vfire box and bridge-wall from the rear wall 2 of the furnace to a point well toward the front end of the boiler, said arch extending under the boiler for a distance approximately two thirds of the length of the boiler'. This arch constitutes the main characteristic feature of my invention, and by its use, a rapid and thorough heating of the boiler is insured. The flame, smoke and gases pass from the fire box forward over the bridge wall, where they are admixed with the air entering through the pipes 17 and the air inlets 16 of the bridge wall. The products of combustion then continue forward as indicated by the arrows passing under the boiler shell, and heating the same throughout its length.

The fire brick arch keeps the products of combustion from cominginto contact with the comparatively cold surface of the boiler, which prevents the perfect combustion of the fuel. By first passing the products of combustion under the :fire brick arch, and by admitting the proper amount of heated air through the pipes or llues, and the hollow bridge, the carbon, and hydro-carbons of the fuel can be consumed before passing from under the arch, thus preventing the formation of soot on the shell and 'flues of the boiler, and thereby greatly increasing their efficiency for transmitting heat to the water. The arch also protects the boiler from the chilling effects of cold air rushing in at the 'fire doors at the time of firing, or when cleaning flues, and hence an almost constantly regular temperature is maintained, which materially prolongs the life of the boiler and adds to its efficiency. The advantage of thus thoroughly consuming the gases and directing them first toward the front under the arch and then toward the rear over the arch, will be readily understood and appreciated.

The location of the re box of a boiler furnace at the rear of the boiler further distinguishes the present invention from the prior art, and such location of the fire box is necessary to the utilization of the arch 18.

The placing of the grate at the rear instead of at the front of the boiler as is the usual practice,perrnits the employment of a longer arch, and enables me to retain all of the heating surface of the boiler.

The invention is not restricted to the minor details shown, but includes all such modifications and variations as may be made Without departing from the essential features of the improvement, or the scope of the following claims.

Having fully described my invention, what I claim as new and desire to secure by Letters Patent, is

In a boiler furnace, the combination with a rear wall provided with a fuel and an ash pit opening, a grate supported adjacent to said opening, a hollow bridge wall in front of said grate and projecting'above the latter, said bridge Wall having the top thereof projecting downwardly at an inclination the inclination being in a direction extending from the fire box, said bridge wall further having at-the junction of the front thereof with the top a plurality of upwardly extending inclined discharge passages, air pipes having their rear ends opening into the space within said bridge wall at the bottom thereof and their other ends opening into the atmosphere through the front wall, said pipes arranged in close proximity to the bottom ofthe furnace, and an arch extending from the rear wall over the grate and bridge wall and projecting past the bridge wall, said arch inclining d ownwardly from the rear and towards the front wall of the furnace and extending in the same plane throughout, and said bridge wall arranged at a position approximately centrally of the length of the arch.

In testimony whereof I afhx my signature in the presence of two witnesses.

PETER SWANGER.

Witnesses:

MAx H. SnoLoviTz, E. E. POTTER. 

